<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
			var a="6",b=6;
			//alert(a==b);
			alert(a===b);
			var w;
			alert(w);
			var h=null;
			alert(w==h);
			alert(">>>>>>>>>>>>>>>");
			alert(w===h);
		</script>
	</head>
	<body>
	</body>
</html>
